Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 561 (DATA COMMUNICATIONS SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U1829CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
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APM
- Ignition OFF, test for less than 1.0 Ξ© between the accessory DC power control module case and ground strap.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Disconnect harness connector X3 of the accessory DC power control module.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal A and ground.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the control circuits of the accessory DC power control module for a short to ground.
- Ignition OFF, disconnect harness connector X1 of the accessory DC power control module.
- Ignition ON, verify that a test lamp illuminates between the wake up signal circuit terminal 3 and ground.
- If the test lamp does not illuminate, test the wake up signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the serial data gateway module.
- If all circuits test normal, replace the accessory DC power control module.
PIM
- Ignition OFF, disconnect harness connector X1 of the drive motor generator power inverter module (PIM).
- Ignition ON, verify that a test lamp illuminates between each B+ circuit and ground.
- If the test lamp does not illuminate, test each B+ circuit for an open/high resistance. If the circuit fuse is open, test the control circuits of the PIM for a short to ground.
- Verify that a test lamp illuminates between the ignition circuit terminal 20 and ground.
- If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit fuse is open, test the control circuits of the PIM for a short to ground.
- Verify that a test lamp illuminates between the wake up signal circuit terminal 19 and ground.
- If the test lamp does not illuminate, test the wake up signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the serial data gateway module.
- If all circuits test normal, replace the drive motor generator power inverter module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.